Amulet of the Impeccable Spy
A large malice beast eye, and a mirror that showed the beast its reflection before it died.
The side of this amulet that faces outward is just mirror, often a copper disk with silver studs. On the reverse is a preserved malice beast eye facing the wearer.
While you are wearing the amulet you benefit from the following properties:
You are aware whenever you fail a Deception or Stealth check.
You can use a bonus action to instantly stow away your clothes and put on a mundane non-armor outfit within 5 feet of you, which temporarily transmutes into a perfect fit while you are wearing it. This allows you to remove clothes from a helpless or unconscious person and don them instantly. This property can be used no more than once per hour.
You can cast true seeing without verbal or somatic components, but you must rub the material component (a 25 gp ointment) onto the malice beast eye using both hands. Once the amulet has generated this effect, it cannot do so again until the next dawn.